/*
 *	lockdev.h
 *	(c) 1997, 1999 by Fabrizio Polacco <fpolacco@debian.org>
 *	this source program is part of the liblockdev library.
 *
 *
 *	This program is free software; you can redistribute it and/or 
 *	modify it under the terms of the GNU Lesser General Public 
 *	License (LGPL) as published by the Free Software Foundation; 
 *	version 2.1 dated February 1999.
 *
 *	This program is distributed in the hope that it will be useful,
 *	but WITHOUT ANY WARRANTY; without even the implied warranty of
 *	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *	GNU General Public License for more details.
 *
 *	You should have received a copy of the GNU Lesser General 
 *	Public License (LGPL) along with this program;  if not, write 
 *	to the Free Software Foundation, Inc.,
 *	59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 *	On Debian GNU/Linux systems, the complete text of the 
 *	GNU Library General Public License can be found in
 *	`/usr/share/common-licenses/LGPL'.
 *
 *
 *
 *	This library provides a stable way to lock devices on a Linux or
 *	Unix system, both following FSSTND 1.2 and SVr4 device locking
 *	methods, and it's built to be portable and to avoid conflicts
 *	with other programs.
 *	It is highly reccommended that all programs that needs to lock a
 *	device (or test if it is locked), call the functions defined in
 *	the public interface of this library.
 *
 */

#ifndef _LOCKDEV_H_
#define _LOCKDEV_H_

#ifdef	__cplusplus
extern "C" {
#endif

#include <sys/types.h>

/* API of the library */

void liblockdev_incr_debug (void);
void liblockdev_reset_debug (void);

pid_t dev_testlock (const char *devname);

pid_t dev_lock (const char *devname);

pid_t dev_relock (const char * devname,
		  const pid_t  old_pid);

pid_t dev_unlock (const char * devname,
		  const pid_t pid);

#ifdef	__cplusplus
};
#endif

#endif /* _LOCKDEV_H_ */